<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>websocket</title>
</head>
<body>

</body>
<script>
    var ws = new WebSocket("ws://localhost:8989/ws");
    ws.onopen = function(evt) {
        console.log("Connection open ...");
        ws.send("Hello WebSockets!");
    };

</script>
</html>